The background is too messy (ink lighting storm?!? bubbles?!? flares?!? whaat?!?) and fails to create depth, i'd suggest you to use simplier ones.
Again, those bubbles on the top are truly terrible, along with the flares( I feel it's important to reiterate in this case), try to use other effects or no effects instead.
I don't really understand what those black/white/yellow things are... cuts? Shards? Anyway, just like before, fix them or remove them i guess.
As for the render, it's entirely covered by a flare and i'm lead away from it by the immense mess of the background, thus you should make the render more visible.
The text seems to be grey-ish inside, the font doesn't look well (and by well i mean professional to any degree).

Also i notice borders have some weird pixelated areas, that may happen when you use a value layer (i believe, in gimp it's the last one, but i've never paid attention to it), you may want to fix it.

Overall, here are my suggestions to improve:
1) Keep it simple, you should really start listening to me about this...
2) Once you make a new layer, turn it on and off to see if it's actually an improvement or not (just doing that would've made you scrap the giant flare on his face).
3) Play with layer types.
4) Play with the render.

Right now, because of the missing flow, depth, horrible background and flawed focal point, it's a 3/10. (And i'm quite generous tbh)
Pay more attention to the compisition than the details!

The background is too messy (ink lighting storm?!? bubbles?!? flares?!? whaat?!?) and fails to create depth, i'd suggest you to use simplier ones.
Again, those bubbles on the top are truly terrible, along with the flares( I feel it's important to reiterate in this case), try to use other effects or no effects instead.
I don't really understand what those black/white/yellow things are... cuts? Shards? Anyway, just like before, fix them or remove them i guess.
As for the render, it's entirely covered by a flare and i'm lead away from it by the immense mess of the background, thus you should make the render more visible.
The text seems to be grey-ish inside, the font doesn't look well (and by well i mean professional to any degree).

Also i notice borders have some weird pixelated areas, that may happen when you use a value layer (i believe, in gimp it's the last one, but i've never paid attention to it), you may want to fix it.

Overall, here are my suggestions to improve:
1) Keep it simple, you should really start listening to me about this...
2) Once you make a new layer, turn it on and off to see if it's actually an improvement or not (just doing that would've made you scrap the giant flare on his face).
3) Play with layer types.
4) Play with the render.

Right now, because of the missing flow, depth, horrible background and flawed focal point, it's a 3/10. (And i'm quite generous tbh)
Pay more attention to the compisition than the details!

Ahh okay I seem to realize that all of those focus around issue number 2 so I will work on that
And only thing I used where c4d, render, bubbles no flares or lighting where used